Bertold Wiesner: British scientist "fathered 600 children" by donating sperm at his own fertility clinic

British scientist 'fathered 600 children' by donating sperm at his own fertility clinic Bertold Wiesner set up the controversial London Barton clinic with his wife Mary Bartons in the 1940sOnly select members of the couple's friends were chosen as donors to help women conceive 1,500 babies Two biological sons have found 18 others conceived at clinic – 12 were fathered by Dr Wiesner | UPDATED: 22:13 GMT, 8 April 2012 A British scientist fathered up to 600 children after founding a fertility clinic that promised to provide sperm donors from ‘intelligent stock’, it emerged yesterday.